HEIR vs Sunlight Hours
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HEIR
Explore thousands of historic photographs and compare them to present-day views. Help researchers track environmental and climate change by re-photographing historical sites and contributing to a global database.
- Access thousands of historic images
- Overlay feature for re-photography
- Track environmental and heritage change
- Contribute to a global database
- Explore past and present landscapes
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HEIR - the Historic Environment Image Resource Join us as we research changes in our environment and landscape from old glass plate and lantern slide photographs. Heir is an important new resource for tracking environmental and climate change, understanding human impact on the planet, identifying endangered landscapes and endangered archaeology, reconstructing lost buildings and habitats, and so much more. Find out more at www.heirtagger.ox.ac.uk/about/about-us Then and now – join the hunt for the past. What did the world look like through a camera 100 years ago? What does it look like today? There are thousands of historic images for you to explore from the HEIR collection. Use this app to call up old images near you. Find the sites, re-photograph them and share your discoveries with researchers worldwide. With the free HEIR app you can: • Access 10,000s of historic images • Use a special overlay feature to help you re-photograph • Be part of a worldwide community tracking environmental and heritage change • Contribute to a worldwide database of information about landscape change The past is on your doorstep – start your travels now! HEIR (Historic Environment Image Resource) is funded by The Reva and David Logan Foundation and the University of Oxford. Visit www.heirtagger.ox.ac.uk find out more.
Sunlight Hours
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- This shows daylight hours in any latitude on any given day - You can also see some information about each planet in our solar system
Screenshots
Verdict
The clearest difference is in-app purchases: HEIR at none against Sunlight Hours's 2. HEIR also leads on ads (none vs shown) and iOS requirement (6.0 vs 16.6). Sunlight Hours's advantage is update cadence (every 3 days vs every 6 months). On price 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. Sunlight Hours sells 2 one-off in-app purchases. HEIR asks for nothing beyond the download.
HEIR ships an update every 6 months, Sunlight Hours every 3 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.
| Parameter | HEIR | Sunlight Hours |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 6 months | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 6.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 30 MB | 44 MB |
| Age rating | 4+ | 17+ |
| Developer | Keepthinking Limited | NovaNext |
In-app purchases
HEIR
No in-app purchases
Sunlight Hours
- Coffee$0.99
- Remove Ads$0.99
