Comparison

Reactor Idle Tycoon vs Assembly Line 2

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

Head to head
About

Reactor Idle Tycoon

Build and manage your own energy empire, from wind turbines to advanced reactors. Generate electricity, manage heat, and sell power for profit in this engaging idle strategy game. Unlock new maps and technologies to maximize your earnings.

Highlights
  • Build various power generation facilities
  • Manage heat and stability of reactors
  • Idle mechanic for offline earnings
  • Unlockable maps and upgrades
  • Complex strategy with easy learning curve
  • Research system for advancements
Features
Read full description

Do you want to create your own reactor and generate energy for an entire country? Or maybe you want to harness the electric power and sell it for a profit? Reactor allows you to do that and so much more in one of the most intense and one of a kind strategy games that you have ever played. The premise in Reactor is very simple, you have to create power plants and generate as much electricity and heat as possible all while keeping everything under control and converting it into a lot of money. You will have to start off easy, with the help of small wind turbines that will generate a little electricity, enough to get your business going. Then you have to focus on getting stuff like offices and more turbines, solar panels, generators, coal burners, and in the end you will have the ability to create your own reactor, be it a nuclear, thermonuclear or fusion reactor, something that is very important to keep an eye on. Reactors are by far the best if you want a great return on investment but they are also the less stable and you have to manage heat as they can easily become unstable. With more than 10 maps to unlock and play, you will always have your hands full as you will try to figure out the best way to make insane profits and obtain a stellar result. You can play it safe and run a business that brings less but stable amounts of money, or you can check out alternative methods that are riskier but with a better return on investment. Reactor is an astounding idle game, one that manages to bring in front extraordinary gameplay moments and stunning opportunities. It’s very fun to play and you can easily use it as an idle game, because resource production will take place even as you go away, which is even more exciting. In Reactor you have all the power in your hands and it all comes down to you to make the right choice and take this one of a kind gameplay mechanic to new heights. With incredibly fun gameplay, nice mechanics and interesting choices, Reactor is the ultimate game that you want to play. A sheer combination of strategy, idle gaming and perfect unlock system, Reactor will help you spend your time wisely with amazing moments and a stellar outcome. Features: • Multiple buildings to choose from • A complex game that’s easy to learn and hard to master • Idling mechanic that allows you to earn resources even if you are offline • You have the first map for free, the others need to be unlocked • Multiple upgrades to choose from • Interesting gameplay mechanics that you have to keep an eye on at all costs • Stellar research system

About

Assembly Line 2

Build and manage a factory to craft and sell resources. Optimize your assembly line with various machines and upgrades to maximize profits, even while offline. Discover new resources and make strategic decisions to grow your industrial empire.

Highlights
  • Build and optimize 21 different machines
  • Unlock tons of upgrades
  • Craft around 50 unique resources
  • Offline progress generation
  • Informative machine and resource data
  • Progress backup
Features
Read full description

Welcome to Assembly Line 2, the sequel to the factory-building and managing game. Assembly Line 2 combines elements from idle and tycoon games. Make the most money by using different types of machines to build an assembly line to craft resources and sell them. Unlock upgrades to make it more efficient and expand your factory. The goal is simple, build resources and sell them. Starting with a few machines and very basic resources, and using them with more advanced machines to craft and create more complex resources. Your factory will continue generating money even when you are offline. When you return to the game you will have piles of money waiting for you, but don't spend it all in one place! While Assembly Line 2 is an idle game, because you make the layout of your factory, it is up to you to optimize it to make the most money possible. Don't worry if you get lost with all those machines to build, the game offers an information menu so you can see what each machine does at any time. It also offers information on each resource price, so you can make decisions on what to craft. You can also see stats on the amount you are producing. Features: - 21 different machines to build and optimize the best factory. - Tons of upgrades to increase productivity. - Around 50 different unique resources to craft. - Multi-language support. - Backup your progress. - No internet required.

Screenshots

Reactor Idle Tycoon4 screens
Assembly Line 24 screens

Verdict

The call

The clearest difference is in-app purchases: Assembly Line 2 at none against Reactor Idle Tycoon's 10. Assembly Line 2 also leads on update cadence (weekly vs every 4 months). Reactor Idle Tycoon's advantage is ratings volume (7.6K vs 1.6K). On price, rating, review sentiment 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Reactor Idle Tycoon sells 10 one-off in-app purchases. Assembly Line 2 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Reactor Idle Tycoon against 4.8 for Assembly Line 2. Both are backed by a comparable volume of ratings — 7.6K and 1.6K respectively. Written reviews are what separate them: 74% of Reactor Idle Tycoon's written reviews are positive against 80% of Assembly Line 2's.

UpkeepUpdate frequency

Reactor Idle Tycoon ships an update every 4 months, Assembly Line 2 weekly. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

Scorecard4 real differences · 6 level
Reactor Idle Tycoon versus Assembly Line 2: the parameters behind the verdict, then further details
ParameterReactor Idle TycoonAssembly Line 2
PriceFreeFree
Rating4.7 (7.6K ratings)4.8 (1.6K ratings) — better
Positive reviews74.2% of reviews79.6% of reviews — better
Number of ratings7.6K — better1.6K
Update frequencyEvery 4 monthsWeekly — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better14.0
Further details — not scored
Size131 MB138 MB
Age rating4+4+
DeveloperRobert GrzybekJoao Reis

Customer experience

Reactor Idle Tycoon

All ratings7,617 ratings
Positive94.2%
Neutral3.8%
Negative1.9%
Written reviews372 reviews
Positive74.2%
Neutral7.5%
Negative18.3%

Assembly Line 2

All ratings1,479 ratings
Positive94.9%
Neutral3.3%
Negative1.8%
Written reviews225 reviews
Positive79.6%
Neutral12.0%
Negative8.4%

User reviews

Reactor Idle Tycoon

From 7.6K App Store ratings

What we love

  • 👍 Simple and enjoyable gameplay
  • 🚀 Fast progression
  • 💡 Unique concept
  • 🎨 Appealing graphics

Room to improve

  • 🕰️ Slow progression at later stages
  • 💰 Expensive in-app purchases
  • 📢 Intrusive ads
  • 🐛 Bugs and glitches

Assembly Line 2

From 1.6K App Store ratings

What we love

  • 🚀 Fun gameplay
  • 👍 Optional ads
  • 🎨 Good visuals
  • 🕹️ Engaging factory management

Room to improve

  • 🐛 Clunky controls
  • 🔋 Battery drain issues
  • 🧭 Unclear progression
  • 🧠 Tedious menu navigation

Bugs and requests

Reactor Idle Tycoon

Reported bugs

3 issues
  • Money resets to zero
  • Research points not properly calculated
  • Inconsistent ad rewards

Requested features

4 requests
  • More content and upgrades
  • Ability to upgrade existing buildings
  • Faster removal of trees and mountains
  • Offline progress improvements

Assembly Line 2

Reported bugs

3 issues
  • Inconsistent offline earnings
  • Crafters and splitters stop working
  • Crashes on launch

Requested features

4 requests
  • Copy/paste assembly lines
  • Rotate/flip multiple machines
  • Pause production
  • Better performance optimization

In-app purchases

10 purchases

Reactor Idle Tycoon

One-time10
  • Unlock Area$1.99
  • Unlock Area 1$2.99
  • Unlock Area 2$2.99
Show 7 more
  • 20x Tools$2.99
  • Unlock Area 3$3.99
  • Buy Research Points$3.99
  • Unlock Area 7$5.99
  • 50x Tools$5.99
  • Unlock Special Map!$9.99
  • Remove banner and get 100% bonus!$9.99
None

Assembly Line 2

No in-app purchases

Questions

Is Reactor Idle Tycoon free?
Reactor Idle Tycoon is free to download, with in-app purchases available.
Is Assembly Line 2 free?
Assembly Line 2 is free to download, with no in-app purchases.
Which has better reviews, Reactor Idle Tycoon or Assembly Line 2?
Assembly Line 2 is rated higher. Reactor Idle Tycoon averages 4.7 out of 5 from 7.6K ratings, while Assembly Line 2 averages 4.8 from 1.6K ratings.
Do Reactor Idle Tycoon or Assembly Line 2 have ads?
Both Reactor Idle Tycoon and Assembly Line 2 show ads.
Which is updated more often, Reactor Idle Tycoon or Assembly Line 2?
Reactor Idle Tycoon ships an update every 4 months, and Assembly Line 2 weekly. Most recently, Reactor Idle Tycoon was updated on October 26, 2026 and Assembly Line 2 on October 27, 2026.

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