Heatmap Studio vs Spread Planner
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Heatmap Studio
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Heatmap Studio shows a table of numbers as a color heatmap. You can start from a blank grid, paste a table, or import a CSV or TSV file. You can edit cells and labels, choose colors, and view basic figures such as the minimum, maximum, and average. Projects are stored in the app on this device. You can export a PNG image or a CSV file. The colors are there to help you view the numbers. Please check important numbers yourself.
Spread Planner
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Spread Planner is a planner that shows your week and your handwritten notes as a two-page spread. With week, month and year spreads, you can see all the way to next year. - Opens like an A6 planner The inner display of iPhone Duo has almost the same proportions as A-series paper. Open it and your week sits on the left page and your notes on the right, just like an open A6 planner. Half-open it and the fold becomes the spine. Close it to see just today's page. - Your week on the left, handwriting on the right Type your plans for each day on the week page. Events from your iOS Calendar appear right on the lines (read only, never changed). Japanese public holidays can be shown on the dates. Write by hand on the note page. - Choose your paper Lined and grid paper are free. Pro adds dot, blank, timeline and two-column paper, and you can pick a different paper for every week. - Monthly and yearly spreads (Pro) See the whole month across two pages. Like a paper planner, the seven days span both pages, with monthly notes at the far right. Tap a day to jump to that week. The yearly spread shows January to June on the left and July to December on the right. Days you wrote on and stamped stand out, and tapping a month opens it. - Planner stamps (Pro) Mark days with 16 stamps such as birthday, deadline, travel and doctor (up to 3 a day). They show on the monthly and yearly pages too. - Cover and paper colors (Pro) Choose from 7 cover colors, including navy, forest, leather and sakura, and 5 paper colors. - Export and print (Pro) Export any week, month or year spread as an A4 landscape image or PDF, then print it or save it to Files. - Home Screen widgets (Pro) Put today's plans and this week's seven lines on your Home Screen. Tap to open that page of your planner. - Works on regular iPhone and iPad On iPhone, flip between Today, Week, Notes, Month and Year with the switcher at the top. Turn iPad sideways for the spread. - Night paper In Dark Mode the page turns to a softer "night paper". - Your writing stays on your device No account needed. Everything you write is stored only on your device and never sent anywhere. No ads. - Pricing Week pages, handwritten notes, lined and grid paper, calendar events, Japanese public holidays and text size settings are free. Spread Planner Pro (one-time purchase) unlocks monthly and yearly spreads, stamps, cover and paper colors, export and print, Home Screen widgets, and every paper type.
Screenshots
Verdict
The clearest difference is in-app purchases: Heatmap Studio at none against Spread Planner's 1. Spread Planner's advantage is ads (none vs shown) and update cadence (monthly vs every 12 months). On price, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Spread Planner sells 1 one-off in-app purchase. Heatmap Studio asks for nothing beyond the download.
Heatmap Studio ships an update every 12 months, Spread Planner monthly. The most recent releases landed on November 8, 2026 and November 10, 2026 respectively.
| Parameter | Heatmap Studio | Spread Planner |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 12 months | Monthly โ better |
| Ads | Yes | No โ better |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 โ better | 18.0 |
| Further details โ not scored | ||
| Size | 5 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Japality Limited | SANWA Inc. |
In-app purchases
Heatmap Studio
No in-app purchases
Spread Planner
- Spread Planner Pro$6.99
Questions
Is Heatmap Studio free?
Is Spread Planner free?
Do Heatmap Studio or Spread Planner have ads?
Which is updated more often, Heatmap Studio or Spread Planner?
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