Comparison

HEIR vs Dinosaur Guide.

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Dinosaur Guide.

Explore prehistoric species, fossil discoveries, and scientific classifications offline. This app offers structured profiles with details on size, diet, habitat, and geological periods. Includes learning tools like quizzes and a glossary for enthusiasts and students.

Highlights
  • Dinosaur profiles with classifications
  • Fossil discovery information
  • Geological time period details
  • Offline access
  • Quiz mode for knowledge testing
  • Search and category browsing
  • Favorite dinosaur saving
Features
Read full description

Explore dinosaurs, prehistoric species, and fossil discoveries. Dinosaur Guide is an offline reference for learning about dinosaurs and the prehistoric world of the Mesozoic era. Discover structured information about dinosaur species, fossil discoveries, and scientific classifications in a clear and accessible format. The app provides organized dinosaur profiles including size, diet, habitat, and geological time periods, making it useful for study, quick reference, and general exploration. Dinosaur Profiles • Learn about many dinosaur species • Discover scientific names and classifications • Explore fossil discoveries and prehistoric history • Understand physical characteristics and traits Dinosaur Information • Size and body structure • Diet and feeding behavior • Habitat and geographic distribution • Geological periods such as Triassic, Jurassic, and Cretaceous Fossils and Paleontology • Learn where dinosaur fossils were discovered • Explore fossil sites around the world • Understand how paleontologists study prehistoric life Learning Tools • Interesting dinosaur facts for quick learning • Quiz mode to test dinosaur knowledge • Glossary explaining paleontology terms Search and Discovery • Search dinosaurs quickly • Explore species through organized categories • Browse prehistoric animals easily Favorites • Save your favorite dinosaurs • Quickly access species you want to study again Designed for Easy Use • Clean and simple interface • Organized dinosaur entries • Works fully offline Premium Features Upgrade for additional benefits: • Ad-free experience • High-resolution dinosaur images • Enhanced learning experience Privacy Focused • No unnecessary permissions • No personal data collection • Information remains on your device Who This App Is For • Students learning about dinosaurs • Teachers and educators • Paleontology enthusiasts • Dinosaur fans of all ages Dinosaur Guide helps you explore prehistoric species, learn dinosaur facts, and understand the ancient world of the Mesozoic era. Download Dinosaur Guide to discover the fascinating world of dinosaurs. LICENSED APPLICATION END USER LICENSE AGREEMENT: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

HEIR4 screens
Dinosaur Guide.4 screens

Verdict

The call

The clearest difference is review sentiment: Dinosaur Guide. at 100% against HEIR's 33%. Dinosaur Guide. also leads on rating (5.0 vs 3.0) and update cadence (every 3 weeks vs every 6 months). HEIR's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, ratings volume 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Dinosaur Guide. sells 2 in-app purchases, starting at $1.99 per month. HEIR asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Dinosaur Guide. holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 33% of HEIR's written reviews are positive against 100% of Dinosaur Guide.'s.

UpkeepUpdate frequency

HEIR ships an update every 6 months, Dinosaur Guide. every 3 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

Scorecard7 real differences · 3 level
HEIR versus Dinosaur Guide.: the parameters behind the verdict, then further details
ParameterHEIRDinosaur Guide.
PriceFreeFree
Rating3.0 (1 ratings)5.0 (1 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings11
Update frequencyEvery 6 monthsEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS6.0 — better15.0
Further details — not scored
Size30 MB212 MB
Age rating4+4+
DeveloperKeepthinking LimitedOlga Ivanova

Customer experience

HEIR

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews3 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

Dinosaur Guide.

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

HEIR

No in-app purchases

2 purchases

Dinosaur Guide.

Subscriptions1
  • dinosaurs_subscription$1.991 Month
One-time1
  • dinosaurs_by_oliva_donation$1.99

Questions

Is HEIR free?
HEIR is free to download, with no in-app purchases.
Is Dinosaur Guide. free?
Dinosaur Guide. is free to download, with in-app purchases available.
Which has better reviews, HEIR or Dinosaur Guide.?
Dinosaur Guide. is rated higher. HEIR averages 3.0 out of 5 from 1 ratings, while Dinosaur Guide. averages 5.0 from 1 ratings.
Do HEIR or Dinosaur Guide. have ads?
Dinosaur Guide. shows ads; HEIR does not.
Which is updated more often, HEIR or Dinosaur Guide.?
HEIR ships an update every 6 months, and Dinosaur Guide. every 3 weeks. Most recently, HEIR was updated on November 1, 2026 and Dinosaur Guide. on October 30, 2026.

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