Comparison

Project Summit vs Lact8

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Project Summit

Features
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It started with a race I wasn't ready for: 360 km of gravel in a single day. I prepared for it with three different apps β€”one to train, one to recover, one to eatβ€” that didn't talk to each other. I copied data from one to the next by hand and paid for three subscriptions. I made it through, but I knew something better had to exist: a single app that did the work of a coach. That's Project Summit. Summit is not an AI or a chatbot. It's a sports-science algorithm that mimics the decisions of a real coach: periodization, polarized training and training load (TSS) as its engine. No people-pleasing answers, no plans that contradict themselves week to week. A plan that knows what it's doing. IT ADAPTS TO YOUR BODY, EVERY DAY Summit reads your HRV, resting heart rate and sleep from Apple Health while you sleep. Bad night and low recovery? It swaps your intervals for an easy session and moves the key workout to another day, without you touching a thing. High recovery? It takes the window and raises the intensity. Fitness is earned when the body is ready, not when the calendar says so. IT ADAPTS TO YOUR LIFE Your week isn't fixed: work, kids, errands, surprises. Tell Summit how much time you really have each day. No room today? No problem. Thirty minutes just appeared? Let it know and it plans the right workout. The plan fits your life, not the other way around. BUILT FOR THOSE WHO RIDE WITH POWER - eFTP and power curve with continuous estimation via the CP model. No manual tests. - Critical power and anaerobic capacity calculated from your rides. - Performance Management Chart: CTL, ATL and TSB in real time. The numbers serious cyclists actually use. RACE DAY, IN DETAIL A minute-by-minute nutrition and hydration plan based on your race duration, your weight and the weather where you'll race. With the gels, bars and drinks you actually use, not generic products. CONNECTED TO YOUR ECOSYSTEM Sync with Strava and Hammerhead Karoo natively and push workouts to Garmin, Zwift and MyWhoosh via intervals.icu. Also compatible with Apple Health. Your data where you already train. IS IT FOR YOU? For the amateur cyclist who's serious about improving, whether they race or not. Whether you're preparing a gran fondo, chasing a personal goal or just want to ride stronger. What counts is training with power and with your head. If you want structure and data, not empty motivation, this is your app. Built by a cyclist, for cyclists. The Gran Diagonal β€”crossing Portugal from north to southβ€” I prepared for it 100% with Summit. What I use is what you get. Train harder. Smarter. Privacy Policy: https://projectsummit.app/privacy-policy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Lact8

Read full description

Lact8 helps athletes identify their lactate thresholds (LT1 and LT2) from step test data and calculate personalized training zones. Features: β€’ Record lactate, heart rate, and power/pace from step tests β€’ Automatic threshold detection using proven methods β€’ Multiple zone systems (3-Zone, 7-Zone Touretski, 8-Zone Couzens) β€’ Track threshold progression over time β€’ Export data as CSV, JSON, or Markdown Perfect for cyclists, runners, and triathletes who want data-driven training zones based on their own physiology.

Screenshots

Project Summit4 screens
Lact84 screens

Verdict

The call

The clearest difference is in-app purchases: Lact8 at none against Project Summit's 4. Lact8 also leads on iOS requirement (16.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Project Summit sells 4 in-app purchases, starting at $3.99 per month. Lact8 asks for nothing beyond the download.

UpkeepUpdate frequency

Project Summit ships an update every 5 days, Lact8 weekly. The most recent releases landed on October 5, 2026 and October 6, 2026 respectively.

Scorecard2 real differences Β· 4 level
Project Summit versus Lact8: the parameters behind the verdict, then further details
ParameterProject SummitLact8
PriceFreeFree
Update frequencyEvery 5 days β€” betterWeekly
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhoneiPhone, iPad β€” better
Requires iOS26.016.0 β€” better
Further details β€” not scored
Size24 MB3 MB
Age rating4+4+
DeveloperJordi EspanyolBEN REEVE

In-app purchases

4 purchases

Project Summit

Subscriptions4
  • Project Summit Pro14 Days trial$3.991 Month
  • Project Summit Elite14 Days trial$8.991 Month
  • Project Summit Pro14 Days trial$22.991 Year
Show 1 more
  • Project Summit Elite14 Days trial$59.991 Year
None

Lact8

No in-app purchases

Questions

Is Project Summit free?
Project Summit is free to download, with in-app purchases available.
Is Lact8 free?
Lact8 is free to download, with no in-app purchases.
Do Project Summit or Lact8 have ads?
Neither Project Summit nor Lact8 shows ads.
Which is updated more often, Project Summit or Lact8?
Project Summit ships an update every 5 days, and Lact8 weekly. Most recently, Project Summit was updated on October 5, 2026 and Lact8 on October 6, 2026.

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