TL;DR: Tredict is a German training planning and analysis platform for endurance athletes, triathletes, coaches and clubs. It does two things that almost nobody else does. It stays vendor-neutral, so data from Garmin, COROS, Polar, Suunto, Wahoo and more lands in the same place without anyone pushing you toward their own hardware. And it drops the subscription entirely: read access is free forever, and full access costs 49 euros once for twelve months (Tredict pricing). Coach functions are free, and a coach can cover an athlete’s write access from a prepaid pool in three-month units (coaching with Tredict). The analysis runs deep, with the Banister model for form prediction, more than 90 metrics, automatic threshold detection and custom fields you program yourself in JavaScript. In Tredict’s documentation we did not find a way to record blood lactate tests, or tools for billing your coaching clients. For data-minded athletes and coaches who already run their business elsewhere, Tredict is one of the best value propositions in endurance software.
What Is Tredict?
Tredict is a web platform for planning and analyzing endurance training. It covers cycling, running, swimming, triathlon and other endurance disciplines, and it serves athletes, coaches and clubs from the same product rather than splitting them into separate tiers (Tredict).
The positioning that matters most is in their own words: vendor-neutral, developed and operated in Germany, and owned by no device manufacturer. Most training software sits close to a hardware brand or a marketplace. Tredict deliberately does not. Completed workouts come in from Garmin, COROS, Polar, Suunto, Wahoo, Concept2 and others, and planned workouts sync back to Garmin, COROS, Suunto, Wahoo, Hammerhead, Zwift, icTrainer and the Apple Watch via Watchletic (coaching with Tredict). If your athletes turn up with four different brands on their wrists, that neutrality stops being a slogan and starts being a daily convenience.
Key Features
Planning and the Training Calendar
The calendar has weekly, monthly and yearly views, so periodization and the next three days live in the same tool (training calendar). You build structured workouts from segments, and Tredict calculates the planned effort from them (effort). Plans are reusable: apply one to several athletes at once and Tredict converts its relative intensities to each athlete’s capacity, so 75% of maximum heart rate becomes 135 bpm for an athlete with a maximum of 180 (coaching with Tredict).
Planned workouts land on the athlete’s device, so they see the prescribed intervals during the session instead of reading them off a phone.
Analysis Depth
This is where Tredict spends most of its effort (Tredict):
- Form prediction with the Banister model, so you can project fitness forward rather than only reading it backward (form and fitness)
- Configurable series charts across more than 90 metrics from current recording devices
- Efficiency metrics with trend indicators for aerobic and economic performance (efficiency indicators)
- Redundant effort calculation from power, heart rate and pace, so a missing sensor does not blank out the session (effort)
- Records for fastest distances and maximum averages
- Equipment tracking across bikes, shoes and gear, plus weather data for every session
Body Data and Health
Tredict imports body data from the supported device brands: resting heart rate, HRV as RMSSD, sleep, weight and body composition. For HRV and sleep it calculates a daily baseline over the previous 42 days, once at least 21 readings exist (body data). Athletes can also keep an injury and illness log, which shows up in the training calendar, so a connected coach can adjust the plan around it (injuries and illnesses).
Thresholds and Zones
Tredict detects FTP, functional threshold pace (FTPa), lactate threshold heart rate (LTHR) and maximum heart rate from an athlete’s workouts, for example from a hard race or a 20-minute test. When it finds a new value, it shows a hint on the activity, and you transfer that value to a new capacity revision (automatic determination). Zone templates then fill the zones from those base values (zones).
Zones are configurable for heart rate, power, pace and cadence, and they support period-based revisions. When an athlete’s threshold moves in April, last November’s session keeps being scored against November’s zones, which is what keeps a multi-season trend readable.
Worth saying plainly, since this is our site: that is not a difference between us. Coachbox resolves zones the same way, taking the definition that was in force on the date of the workout rather than the current one. Both products get this right.
Programmable Fields, API and AI
You can write JavaScript inside the platform to compute your own fields, with access to every workout value and your zone and body data (custom fields). There is also a Personal API and the Tredict MCP Server. The MCP Server connects to ChatGPT, Claude, Mistral and other AI assistants. In ChatGPT and Claude.ai you sign in through OAuth, elsewhere you paste a personal access token, and neither needs any programming. From there you ask about your training in plain language, and the assistant can also determine FTP, create structured workouts and build training plans in Tredict (AI and MCP). Detailed data and the extended functions through the MCP Server or the Personal API need full access (Tredict pricing).
What Tredict Costs
The pricing is the most unusual thing about the product.
| Access | Cost |
|---|---|
| Read access | Free, permanently, and it stays free after full access expires |
| Two free months | Full access, gifted on registration |
| Full access | Once for twelve months: 49 EUR including VAT in the euro area, 49 USD including sales tax in the US |
| Coach functions | Free |
Source: Tredict pricing, US pricing, coach.
There is no subscription and no auto-renewal. You pay once, it runs for twelve months, and then it stops rather than quietly charging you again. If you let it lapse, you keep your data and can still look at it, you lose the ability to write.
For coaches the model works differently from most platforms. The coach functions cost you nothing. To write to an athlete’s calendar, that athlete needs write access on their own profile, and there are three ways it gets there (coaching with Tredict):
- The two free months. Every newly registered athlete gets two months of write access on signup.
- Your pool. You buy write access in packages of 12, 60, 120 or 240 months, with 3, 5 and 10 percent volume discounts on the larger ones, and assign it to athletes in units of three months (coaching with Tredict). The athlete does not buy anything. The 12-month package costs the same as the 12 months an athlete buys, so one three-month unit costs a quarter of that.
- The athlete buys it, always twelve months in advance, with no subscription and no auto-renewal. An athlete who already uses Tredict with their own write access costs you nothing.
Tredict calls the pool and the athlete’s own purchase two equally valid routes, and you can combine them as you like. Its own worked examples for the coach’s pool (coaching with Tredict):
| Coaching | Write access from the coach’s pool |
|---|---|
| Athlete already uses Tredict with their own write access | nothing |
| New athlete, 12-week race preparation, plan created within the free months | nothing |
| New athlete, 6 months of coaching, one more new plan after the free months | 3 months |
| Year-round coaching with ongoing planning in the calendar | 12 months |
| 20 new athletes as in the second or third example | nothing or 60 months |
Source: coaching with Tredict.
If the athlete buys write access themselves, the coaching costs you nothing in any of these examples.
Write access matters while you write to the calendar, typically when you set up a new plan. Read access stays for good: you keep analyzing the athlete’s workouts and messaging them, and nobody loses their data when a unit runs out.
How Coaching Works
You connect to an athlete in one of two ways: you share your email address and the athlete uses it to send you a request, or you hand out a request code as a link or a QR, which keeps your address private until the connection is made. The athlete decides whether you get read access only or write access as well. With read access you already see their analysis, training calendar, form curve, body data and equipment. Write access adds editing of their training, zones, capacity and body data (coach, coaching with Tredict).
You talk to your athletes through messages and a chat on each workout, so feedback sits right next to the session it is about. Messaging works without write access too (coaching with Tredict).
A few things extend beyond one-to-one coaching (coaching with Tredict):
- Training plans. You sell plans through Tredict or give them away under a Creative Commons licence. Tredict takes no fee on a sale, only PayPal’s transaction fee applies, and Tredict issues the invoice to the buyer in your name (selling training plans).
- A free public coach profile in Tredict’s coaches directory, which is a small but real acquisition channel.
- A Partner API for companies, clubs and publishers that want to manage and bill many athletes themselves.
Where Tredict Is Strong
Value. Forty-nine euros once for twelve months, with no subscription and no auto-renewal, is far below what most of this market asks of an individual. For a coach, the free coach functions plus write access on demand mean you can run short race preparations at very low cost. Tredict’s own examples show a twelve-week plan for a new athlete, set up within the free months, costing nothing at all (coaching with Tredict).
Neutrality. No hardware brand is steering the roadmap, and it shows in how evenly the device support is handled.
Data ownership. Free read access forever, plus a personal API, means the platform never holds your history hostage to keep you paying.
Zone history. Period-based revisions are the kind of detail only people who actually coach think to build.
Limitations
Lactate tests. Tredict determines the lactate threshold heart rate from workouts, such as a race or a 20-minute test. We did not find a way in its documentation to record blood lactate measurements from a step test and derive LT1 and LT2 from them (capacity, automatic determination). If lactate testing is part of how you coach, plan on doing that work in a separate tool and carrying the results over.
Billing your coaching. Tredict prices access to the platform, not your coaching. It invoices buyers of your training plans for you, and through the Partner API, Tredict bills a company, club or publisher for its athletes’ write access. For invoicing your own one-to-one coaching clients and tracking who has paid you, we did not find a tool in Tredict’s documentation.
Coach education. We did not find a built-in learning track for coaches who want to deepen their own knowledge.
Density. In our view, ninety-plus metrics and programmable fields are a gift to a data-literate athlete and a lot to take in for a beginner. Worth knowing before you put a first-season athlete in front of it.
Tredict and Coachbox
We build Coachbox, so read this section knowing where it comes from. Both products plan and analyze endurance training. Both let you talk to your athletes, right down to comments on a single workout, follow their HRV, sleep and resting heart rate, and keep track of injuries, which Coachbox logs as milestones. Both also connect to ChatGPT, Claude and other assistants over MCP. The differences sit around that core:
- Lactate testing. Coachbox detects LT1 and LT2 automatically in under a minute, from values you enter or from a photo of a paper protocol, and pushes the resulting zones straight into athlete profiles and future plans. Tredict detects thresholds from workout data and lets you enter them by hand (capacity). A lactate test protocol is not something we found in its documentation (automatic determination).
- AI. On top of the MCP connection, Coachbox has its own assistant built in. With Coachbox AI you ask about a specific athlete, a workout or a whole season, and have it write changes straight into the athlete’s training plan, without leaving the platform.
- Running the practice. Coachbox covers PDF reports for test results and the Coachbox Academy for coach education.
How Each One Bills
The two products put the cost in different places, so a single yearly number per roster says little. On Tredict, write access belongs to the athlete’s profile: the athlete buys it, or you assign it from your pool in three-month units, and you only need it while you write to their calendar (coaching with Tredict). Coachbox charges the coach a plan that includes a number of athletes, plus a fee for each extra active athlete, and leaves athletes free. An athlete counts as active when they have workouts planned in the future, so an athlete whose data you only follow does not count toward your plan.
| Tredict | Coachbox | |
|---|---|---|
| Coach account | Free | Base: 19 EUR/month billed yearly, or 25 EUR billed monthly, excl. VAT |
| Athletes included | Not applicable, the coach account has no athlete fee | Base: 5, then 2.50 EUR per extra athlete. Build (49 EUR/month yearly, 65 EUR monthly): 25, then 2 EUR per extra athlete, excl. VAT |
| What a coach pays per athlete | Nothing if the athlete buys write access or during the two free months. Otherwise write access from your pool in three-month units, only while you write to an athlete’s calendar. 12 months cost 41.18 EUR excl. VAT (49 EUR incl. German VAT), a three-month unit a quarter of that | Only for active athletes, meaning athletes with workouts planned in the future. Included in the plan up to its athlete count |
| New athletes | Two months of write access free | Free |
| Athlete account | Read access free, full access 49 EUR incl. VAT per twelve months | Free. Following an athlete’s data without planning ahead does not count toward your plan, so you can still react to workouts they did without a plan at no cost |
| Lactate tests | Not found in the documentation | 3 to 6 EUR excl. VAT per test depending on the plan, with free tests at the start |
| Self-coached athlete | 49 EUR incl. VAT per twelve months | One: 4.76 EUR/month incl. German VAT (4 EUR excl. VAT), billed yearly |
Prices for coaches are shown without VAT and prices for athletes with VAT, the way each is usually bought, so every row compares like with like. Tredict lists 49 EUR including VAT in every euro-area country; we convert with the 19% VAT of Germany, where Tredict is based, which gives 41.18 EUR without VAT. Coachbox lists its prices without VAT. In the US, Tredict charges 49 USD including local sales tax (Tredict pricing, US).
Sources: Tredict pricing, coaching with Tredict, Coachbox pricing.
Which one costs less depends on how you coach. If you set up a plan and let the athlete run it for a race preparation, Tredict’s model can cost you very little, or nothing within the two free months. If you adjust the calendars of a steady roster every week, all year, Tredict’s own example puts that at 12 months from the pool per athlete, which is 41.18 EUR excl. VAT (49 EUR incl. German VAT) per athlete per year before volume discounts, unless the athlete pays for it. From there, a plan with the athletes included starts to compare well.
Who Should Use Tredict
Use Tredict if you are a self-coached endurance athlete who likes data, or a coach whose athletes bring mixed hardware and who already handles lactate testing, invoicing and client management with other tools. If the yearly software bill is the thing standing between you and coaching more athletes, this is, in our view, one of the cheapest serious options on the market.
Look elsewhere if lactate testing is central to your method, or if you want one subscription to cover coaching, testing and the administrative side of a practice.
The Verdict
Tredict is a genuinely good piece of software sold in an unusually transparent way. Free read access forever, one payment a year, no auto-renewal and free coach functions (Tredict pricing) add up to a product that is not trying to trap anyone. The analysis is deep, the neutrality is real, and the zone handling shows that coaches were in the room.
Where we see it stop is lactate testing and billing your own coaching clients. If you handle those elsewhere, Tredict gives you a lot for very little money.
