FLOWBIO vs Negative Split
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FLOWBIO
This app analyzes sweat data to provide personalized hydration and recovery strategies for athletes. It connects to a sweat sensor to track fluid and sodium loss, offering tailored plans and pre-session predictions to optimize performance.
- Personalized hydration strategies
- Tailored recovery plans
- Pre-session performance predictions
- Intake logging
- Support for electrolyte brands
- Integrations with Garmin, Wahoo, Zwift, Coros
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Dehydration, cramps, poor recovery? Most athletes face these problems because they don’t know what they’re really losing in sweat. The FLOWBIO System solves this. By pairing the world’s most accurate sweat sensor with the FLOWBIO App, you can finally connect sweat data to your performance, recovery, and progress. FLOWBIO Sensor: Measures your sweat in real time with lab-grade accuracy, tracking your unique fluid and sodium losses in every run, ride, and race. FLOWBIO App - Transforms your sweat data into simple, personalised hydration strategies. - Tailored recovery plans built from your actual losses. - Pre-session predictions so you start properly prepared. - Intake logging and support for your preferred electrolyte brands. Integrations: - Garmin - Wahoo - Zwift - Coros
Negative Split
This running app offers personalized training plans to help you achieve your race day goals. It integrates strength, recovery, and relaxation exercises to prevent injuries and improve performance.
- Personalized training plans
- Run tracking
- Strength training
- Recovery exercises
- Injury prevention
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Negative Split is a running training app that allows you to select the training plan that suits you best, and then track your runs over the course of that plan. We've also built in strength, recovery, and relaxation training to help you build up to race day, and get round the course injury-free.
Screenshots
Verdict
The clearest difference is review sentiment: Negative Split at 100% against FLOWBIO's 0%. Negative Split also leads on update cadence (daily vs fortnightly) and iOS requirement (18.2 vs 26.0). FLOWBIO's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
FLOWBIO ships an update fortnightly, Negative Split daily. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.
| Parameter | FLOWBIO | Negative Split |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 — better | — |
| Update frequency | Fortnightly | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 26.0 | 18.2 — better |
| Further details — not scored | ||
| Size | 37 MB | 6 MB |
| Age rating | 17+ | 4+ |
| Developer | FLOWBIO LTD | HECTOR SHERLOCK E STANLEY |
Customer experience
FLOWBIO
Negative Split
In-app purchases
FLOWBIO
No in-app purchases
Negative Split
No in-app purchases
Questions
Is FLOWBIO free?
Is Negative Split free?
Do FLOWBIO or Negative Split have ads?
Which is updated more often, FLOWBIO or Negative Split?
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