IHWAP Diagnostics vs DataJot
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IHWAP Diagnostics
This application assists with home weatherization by quantifying air leakage, calculating ventilation needs, and assessing duct system pressure against program standards. It helps prioritize air sealing and ensures compliance with energy efficiency guidelines.
- Zone Pressure Diagnostics (ZPD)
- Total External Static Pressure (TESP) calculation
- ASHRAE ventilation requirements
- Leakage reduction potential estimation
- ENERGY STAR compliance checks
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Illinois Home Weatherization Assistance Program (IHWAP) Diagnostics application for the University of Illinois. This app is the product of a collaboration between the Indoor Climate Research & Training Center’s Senior Weatherization Trainer, Nate Price, and me. The Zone Pressure Diagnostics (ZPD) function will quantify the connection between the house and a zone and between that zone and the outdoors. It will also estimate the total leakage reduction potential in the zone, which should assist with prioritizing air sealing measures. The Total External Static Pressure (TESP) function will calculate total pressure and the pressure caused by the various components of a duct system and compare them to Illinois Home Weatherization Assistance Program (IHWAP) standards for recommended replacement options. The American Society of Heating and Air-Conditioning Engineers (ASHRAE) function will calculate home ventilation requirements ensuring proper pollutant control and ENERGY STAR compliance.
DataJot
Easily track personal metrics like temperature, energy, or mood without complex spreadsheets. Visualize trends with simple charts and customize your data tracking experience. Your data stays private and syncs across devices.
- Custom tracker creation
- Ready-made templates
- Data visualization with charts
- Multi-period trend analysis
- Widget support for quick entry
- Shortcuts app integration
- CSV data export
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DataJot is the simple, private app for tracking the measurements that matter to you. Room temperature, humidity, consumption, budget, workouts, sleep, mood, coffee, counters, routines, or small personal experiments: DataJot helps you record values over time, then turn them into clear trends without opening a spreadsheet for every tracker. Create a series, choose a unit, add measurements in seconds, and let DataJot build a readable view of what is really changing. You stay in control: each tracker can remain simple or become more precise with statistics, thresholds, colors, and custom charts. Flexible tracking, built around your own use cases DataJot does not force a method on you. Create the series you need, organize them with categories, and use ready-made templates to get started faster. Personal measurements, habits, home sensor readings, recurring quantities, or productivity indicators: you decide what is worth observing. Charts that make your data useful View your values as line, area, bar, or point charts. Check changes across different ranges, from day to year, then move through time by scrolling the chart or using the period navigator. Adjust the display, choose visible statistics, and more easily spot variations, averages, extremes, or cumulative totals. When a single value is not enough, add custom thresholds with labels, colors, and axis bounds. DataJot can also show the distribution of your measurements by threshold, helping you understand how much of your data falls into each zone. Import and export across your series Import or export measurements from multiple series in a single CSV operation. Move your data or continue analyzing it with your own tools without repeating the same action for every series. Made for the Apple ecosystem Quickly add a measurement from a widget, view recent charts, and use the Shortcuts app to create series, add values, export data, or fetch your latest aggregates. On Mac, an optional local HTTP server also lets you add or fetch measurements from your own tools. Your data, your rhythm DataJot works without ads and without subscriptions. One purchase gives you the app on iPhone, iPad, and Mac. iCloud sync can keep your trackers available across your Apple devices while keeping your data under your control. DataJot is made for people who want to understand their numbers without complexity: record what happens, see what changes, and build a clear memory of their personal measurements over time.
Screenshots
Verdict
The clearest difference is price: IHWAP Diagnostics at Free against DataJot's $4.99. IHWAP Diagnostics also leads on iOS requirement (16.0 vs 26.0). DataJot's advantage is update cadence (monthly vs every 5 months) and chart position (#193 vs unranked). On rating, review sentiment, ratings volume and ads 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
IHWAP Diagnostics is free to download; DataJot costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for IHWAP Diagnostics against 5.0 for DataJot. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
IHWAP Diagnostics ships an update every 5 months, DataJot monthly. The most recent releases landed on June 5, 2026 and September 22, 2026 respectively.
| Parameter | IHWAP Diagnostics | DataJot |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 5.0 (5 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 5 — better | 2 |
| Update frequency | Every 5 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Best chart rank | — | #193 — better |
| Devices | iPhone, iPad | iPhone, iPad, Mac — better |
| Requires iOS | 16.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 75 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Travis Jenkins | Arthur BABEY |
Customer experience
IHWAP Diagnostics
DataJot
In-app purchases
IHWAP Diagnostics
No in-app purchases
DataJot
No in-app purchases
Questions
Is IHWAP Diagnostics free?
Is DataJot free?
Which has better reviews, IHWAP Diagnostics or DataJot?
Do IHWAP Diagnostics or DataJot have ads?
Which is updated more often, IHWAP Diagnostics or DataJot?
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