Comparison

Second Nature vs Birch Fit

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

Head to head
About

Second Nature

This app uses behavioral science to help you build healthy habits for long-term weight loss. It tracks sleep, exercise, and emotional regulation, offering personalized advice from a nutritionist and a library of recipes and educational articles.

Highlights
  • Behavioral science approach
  • Personalized nutritionist support
  • Holistic habit tracking (sleep, exercise, emotions)
  • Healthy recipe library
  • Daily educational articles
  • Apple HealthKit integration
Features
Read full description

Second Nature exists to change minds about losing weight. Our app uses behavioural science to retrain your mind to make healthy choices automatically, so these stick in the long run. But we don’t just look at what you’re eating and how much you weigh. We also look at your sleep patterns, exercise levels, how you regulate emotions, and other habits that impact the way you might be feeling. We also pair you with a registered nutritionist who provides one-to-one advice and supports you to build new, healthier habits. Our app also has hundreds of simple, indulgent recipes as well as daily articles that explain the science of healthy living - so you feel empowered to make changes, rather than just being told what to do. Britain’s NHS recommends us because their own research suggests we’re twice as effective as other weight-loss programmes. 90% of Trustpilot reviews rate us as ‘excellent’ because 9 out of 10 people lose weight and keep it off, even after 12 months. We want to make losing weight feel easier; to make it feel second nature. Download the app and sign up today to start your journey! Second Nature uses Apple HealthKit to integrate your phone's step data to help you set goals.

About

Birch Fit

Read full description

Take the guesswork out of weight loss with Birch Fit, the coaching app that keeps you accountable, supported and on track every single day. With Birch Fit, you’re never doing this alone. Your coach sees your progress in real time — your calorie balance, activity and weigh-ins and steps in with support the moment you need it. No more drifting off track before anyone notices. With the help of your coach, Birch Fit helps you stay consistent, confident and in control. Staying consistent has never been easier… • Know exactly how much to eat and burn each day • See your calorie balance and progress at a glance • Get reminders that keep you focused and consistent • Log workouts, meals and water intake in seconds • Track your body changes with side-by-side progress photos Every part of the app works together to keep you moving forward, so you always know where you stand and what to do next. ACCOUNTABILITY THAT WORKS When life gets busy, Birch Fit keeps you from slipping through the cracks. Real-time insights mean your coach knows when to step in with a message or video call, helping you reset before you fall behind. It’s not just another fitness tracker. It’s a system built for lasting results — where you’re seen, supported and set up to win.

Screenshots

Second Nature4 screens
Birch Fit4 screens

Verdict

The call

The clearest difference is update cadence: Second Nature at every 3 days against Birch Fit's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Second Nature ships an update every 3 days, Birch Fit every 3 weeks. The most recent releases landed on November 1, 2026 and October 5, 2026 respectively.

Scorecard1 real difference · 9 level
Second Nature versus Birch Fit: the parameters behind the verdict, then further details
ParameterSecond NatureBirch Fit
PriceFreeFree
Rating4.3 (57 ratings) — better—
Positive reviews65.0% of reviews—
Number of ratings57 — better—
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.415.6 — better
Further details — not scored
Size134 MB15 MB
Age rating17+17+
DeveloperSecond Nature Health LtdDaniel Birch

In-app purchases

None

Second Nature

No in-app purchases

None

Birch Fit

No in-app purchases

Questions

Is Second Nature free?
Second Nature is free to download, with no in-app purchases.
Is Birch Fit free?
Birch Fit is free to download, with no in-app purchases.
Do Second Nature or Birch Fit have ads?
Neither Second Nature nor Birch Fit shows ads.
Which is updated more often, Second Nature or Birch Fit?
Second Nature ships an update every 3 days, and Birch Fit every 3 weeks. Most recently, Second Nature was updated on November 1, 2026 and Birch Fit on October 5, 2026.

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