Comparison

Calibrate vs Prep Clock

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

Head to head
About

Calibrate

Features
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Calibrate: Time Block Planner Plan your time. Track what actually happens. See the difference. Calibrate is a focused time-blocking app that helps you understand where your time really goes. Schedule your day, run your sessions, and review the gap between intention and reality. Most productivity apps help you plan. Calibrate helps you measure, reflect, and improve β€” week after week, and now across the year. Whether you’re studying, building projects, learning a language, or trying to create better daily structure, Calibrate gives you a simple system to plan your time, track what actually happens, and learn from the difference Plan with clarity Create time blocks for what matters most. Design a realistic day around your priorities β€” work, learning, focus sessions, rest. Track effortlessly Start a block, stay focused, and let Calibrate quietly log what you really do. No clutter. No noise. Just clean, intentional tracking. Reflect meaningfully See how your days and weeks actually unfold. Discover patterns. Notice drift. Reinforce what’s working. Build a lasting rhythm Calibrate isn’t about perfect days. It’s about building consistency over time β€” and shaping a routine that fits your real life. Calibrate Pro β€” go deeper with your time Upgrade to Calibrate Pro to unlock long-term history and deeper reflection tools. Explore how your time evolves across weeks and months, spot real trends, and make better long-term adjustments. Calibrate is built for people who care about how they spend their time β€” and want a simple, thoughtful way to improve it. Plan less. Understand more. Build a rhythm that lasts. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Prep Clock

Features
Read full description

Leave on time without guessing. Prep Clock starts with your arrival time, works backward through travel and preparation, and tells you exactly when to begin. PLAN THE WHOLE DEPARTURE - Build reusable routines from real prep steps. - Add destination, travel mode, buffer, and arrival time. - See start-prep, leave, and arrive times together. - Run tasks step by step with per-task timing. - Recalculate when traffic or the plan changes. - Use Running Late mode to see an honest updated arrival estimate. LEARN YOUR REAL TIMING - Record how long tasks actually take. - Compare planned and observed duration ranges. - Apply adaptive estimates to future plans. - Generate upcoming events from recurring prep plans. FREE - Up to three upcoming events and three custom routines. - Core backward planning and commute calculation. PREP CLOCK PRO - Unlimited events and routines. - Recurring plans and adaptive timing. - Calendar import and sync. - Running Late mode and additional travel modes. - Home Screen widgets and Lock Screen Live Activities. Calendar, location, and notification permissions are requested only when the related feature needs them. Schedule, task, and location details are not sent to an AI service. Subscriptions renew automatically unless canceled in your Apple ID settings. Restore an existing purchase from Settings > Restore Purchases. TERMS OF USE Product Terms of Use: https://www.uncommonweather.com/legal/apps/prepclock-terms.html Apple Standard Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Calibrate4 screens
Prep Clock4 screens

Verdict

The call

The clearest difference is update cadence: Prep Clock at every 4 days against Calibrate's fortnightly. On price, ads, in-app purchases 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. Calibrate sells 1 one-off in-app purchase and Prep Clock sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Calibrate ships an update fortnightly, Prep Clock every 4 days. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.

Scorecard1 real difference Β· 5 level
Calibrate versus Prep Clock: the parameters behind the verdict, then further details
ParameterCalibratePrep Clock
PriceFreeFree
Update frequencyFortnightlyEvery 4 days β€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.6 β€” better18.0
Further details β€” not scored
Size4 MB16 MB
Age rating4+4+
DeveloperWarren PetersRyan Tinklepaugh

In-app purchases

1 purchases

Calibrate

One-time1
  • Calibrate Pro β€” Lifetime$9.99
2 purchases

Prep Clock

Subscriptions2
  • Pro Monthly$2.991 Month
  • Pro Annual$19.991 Year

Questions

Is Calibrate free?
Calibrate is free to download, with in-app purchases available.
Is Prep Clock free?
Prep Clock is free to download, with in-app purchases available.
Do Calibrate or Prep Clock have ads?
Neither Calibrate nor Prep Clock shows ads.
Which is updated more often, Calibrate or Prep Clock?
Calibrate ships an update fortnightly, and Prep Clock every 4 days. Most recently, Calibrate was updated on September 10, 2026 and Prep Clock on September 9, 2026.

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