Pace Adjuster vs StackDay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pace Adjuster
This app helps runners maintain their target pace during training and races. It provides real-time vibrational feedback to alert users if they are running too fast, too slow, or are on pace. Achieve your running goals with intelligent pace guidance.
- Set goal pace and distance
- Real-time vibrational feedback
- Alerts for too fast/slow pace
- Smart pace guidance
- Focus on energy conservation
- Improve running efficiency
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Pace Keeper: Keep Pace, Crush Your Goals Take the guesswork out of running and nail your pace every time! Whether you’re training for your first 5K, chasing a marathon PR, or just looking to run more efficiently, Pace Keeper is like having a personal coach right on your wrist. Simply set your goal pace and target distance, and Pace Keeper does the rest. With real-time feedback, your watch will gently vibrate to let you know when you’re: • Too fast – slow down and save energy for the finish. • Too slow – pick it up and get back on track. • Right on pace – keep cruising and stay confident. No more constantly checking your watch or second-guessing your speed. Smart Pace helps you stay focused, conserve energy, and train like a pro. Whether you’re running for fun, fitness, or competition, Pace Keeper will help you run smarter, improve faster, and cross the finish line feeling strong and accomplished. Your perfect run is just a vibration away!
StackDay
This app helps you consistently take your vitamins and supplements. Log doses, build streaks, and view your adherence over time. It offers smart reminders and pre-loaded supplement information to make tracking easy.
- Daily checklist for all supplements
- 50+ pre-loaded supplements
- Streak and adherence statistics
- Customizable smart reminders
- Local data storage for privacy
- Home screen widget (Pro)
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StackDay is the supplement and peptide tracker that finally makes you consistent — check off doses in one tap, watch your streak grow, and see which stacks actually work. NEW: PEPTIDES + PROTOCOLS A dedicated Peptides tab for BPC-157, TB-500, semaglutide, retatrutide, and every peptide in between. • Vial tracking with a 28-day reconstitution countdown • Titration schedules that auto-step your dose week by week for GLP-1s • Active-level curves (Pro) — see estimated compound levels between doses so you know when the next one is really due RECONSTITUTION CALCULATOR Enter your vial strength and BAC water; get exact U-100 syringe units instantly. Reverse mode lets you dial a target dose and see the water to add — no more scribbling on the back of a bottle. INJECTION SITE ROTATION A tappable body map covering all 8 subQ sites. Auto-suggests the most-rested spot every time you log a dose, so you never accidentally double up. DAILY CHECKLIST Your entire stack in one screen, split by morning, meal, afternoon, pre-workout, evening, and bedtime. Tap to check off each supplement. Satisfying haptics every time. 1,000+ SUPPLEMENT LIBRARY Vitamins, minerals, adaptogens, nootropics, mushrooms, and performance compounds — all pre-loaded with common dosages and units. Add your full stack in 30 seconds. Scan any label with your camera (Pro). STREAKS, QUESTS, AND BADGES • 24 illustrated achievement badges spanning streaks, logging milestones, peptides, and exploration • 3 weekly quests that rotate on a fresh cycle every week • Streak Freezes bank automatically at milestones and protect a missed day — because life happens INTERACTIVE WIDGETS • Medium Home Screen widget with tap-to-check-off buttons — mark doses without opening the app • Small widget and Lock Screen widgets for at-a-glance progress • Peptide widget showing your next dose and vial countdown • Mark doses taken right from notifications INTERACTION AWARENESS 16 built-in interaction checks (calcium and iron, coffee and ashwagandha, and more). Timing suggestions space competing supplements hours apart so absorption doesn't fight itself. PROGRESS THAT MEANS SOMETHING • 30-day adherence per supplement — see your true best performers • Monthly heatmap calendar • Wellness correlation (Pro) — spot which supplements actually move your mood, energy, sleep, and focus • Apple Health integration for sleep, steps, and workouts STACKDAY PRO • Unlimited history and full per-supplement stats • Active-level curves for peptides • Custom reminder times for every one of the 8 slots • Label scanner and AI Supplement Advisor • Wellness correlation insights and weekly recaps Free tier includes full daily tracking, 7-day history, slot reminders, and the reconstitution calculator. NOW IN 6 LANGUAGES English, German, Spanish, French, Portuguese, and Japanese — with more on the way. PRIVATE BY DESIGN Your data stays on your iPhone. No account required. Everything is stored locally. Built for anyone who spends money on supplements and peptides but never sees the payoff because they can't stay consistent. Every dose logged. Every streak counted. Every stack proven. Privacy Policy: https://foggy-labs.github.io/privacy/stackday Terms of Use: https://foggy-labs.github.io/terms Support: https://foggy-labs.github.io/support
Screenshots
Verdict
The clearest difference is in-app purchases: Pace Adjuster at none against StackDay's 8. Pace Adjuster also leads on ads (none vs shown). StackDay's advantage is ratings volume (5 vs 1) and iOS requirement (17.0 vs 26.0). On price, rating 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. StackDay sells 8 in-app purchases, starting at $0.99 per 7 days. Pace Adjuster asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Pace Adjuster against 5.0 for StackDay. That said, the two scores are not equally well evidenced: StackDay has 5 ratings behind it against 1, so its average is the more settled of the two.
| Parameter | Pace Adjuster | StackDay |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (5 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 5 — better |
| Update frequency | — | Every 3 days |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 20 MB |
| Age rating | 4+ | 12+ |
| Developer | Andrew Lapin | Fog Hill, LLC |
Customer experience
Pace Adjuster
StackDay
In-app purchases
Pace Adjuster
No in-app purchases
StackDay
- Pro Weekly Discount3 Days trial$0.997 Days
- Pro Weekly3 Days trial$1.997 Days
- Pro Monthly Discount$3.991 Month
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- StackDay Pro Monthly$4.991 Month
- StackDay Pro Monthly Subscription3 Days trial$4.991 Month
- Pro Annual Discount$19.991 Year
- StackDay Pro Annual Subscription3 Days trial$24.991 Year
- StackDay Pro Annual7 Days trial$49.991 Year









