The runner-first Sauce for Strava alternative
Sauce for Strava is excellent, and it shares the same principle that matters most: it runs client-side and never uploads your data. Negative Split takes that same local, private approach and makes it focused for runners: a cleaner, more approachable read of your own Strava pages, plus honest race predictions, age-graded PBs, a VDOT VO2max estimate, a pace-duration curve, Critical Velocity and a free Year-in-Sport recap.
Negative Split vs. Sauce for Strava
Both are free and both stay on your device. The real difference is focus: Sauce is a powerful, analytics-dense, all-round tool, while Negative Split is a cleaner, running-first read with a few extras built for runners.
| Negative Split | Sauce for Strava | |
|---|---|---|
| Focus | Runner-first, clean and approachable | All-round, analytics-dense, cycling-leaning |
| Price | Free | Free |
| Runs locally, nothing uploaded | Yes | Yes |
| Honest race predictions | Yes, 5K–Marathon | Not a runner-focused predictor |
| Pace-duration curve + Critical Velocity | Yes | No |
| Age-graded PBs (WMA 2025 tables) | Yes, with class bands | No |
| VDOT (VO2max estimate) | Yes, Daniels method | No |
| Free Year-in-Sport recap | Yes | No |
| Auto interval detection | Yes, each rep listed | Not the same running-first read |
| Suggested workout title on edit | Yes | No |
Sauce for Strava is a capable, privacy-respecting tool, and we like it. Its exact feature set is decided by its own project and may change, so check their site for what it does today.
Why try Negative Split instead
Same local, no-upload ethos as Sauce, tuned for one thing: helping you run better.
- ✓Running-first, not everything-first. Every metric is chosen for runners: negative-split pacing, hill-fair GAP, time-in-zone and the 80/20 read, so you are not digging through a dense, all-sport dashboard to find what matters.
- ✓Cleaner, more approachable. The numbers sit right on the Strava pages you already use, laid out to read at a glance instead of a wall of analytics.
- ✓Honest predictions and race-ready curves. A grounded 5K–Marathon race predictor, a pace-duration curve and Critical Velocity, plus auto interval detection that lists every rep.
- ✓Extras Sauce does not add. A free Year-in-Sport recap built from your own history, and a suggested workout title and description on the run edit page. Copy it only if you like it.
Negative Split for Strava
A runner-first, 100% local read of your own Strava pages: rTSS, hill-fair GAP, zones, PMC, auto interval detection, honest 5K–Marathon race predictions, a pace-duration curve, Critical Velocity and a free Year-in-Sport recap. Same local, no-upload ethos as Sauce, focused for runners.
- ✓ Free, no login, no subscription
- ✓ 100% in your browser, nothing uploaded
- ✓ Runner-first, transparent, deterministic math
Negative Split is an independent project. It is not affiliated with, endorsed by, or sponsored by Strava, Inc. Strava is a trademark of Strava, Inc.