Comparison

Decision Logic vs Erebus Solar

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

Head to head
About

Decision Logic

This app helps you make better decisions by comparing multiple options based on your priorities. It guides you through a structured process to evaluate choices, avoid regret, and feel confident in your selections.

Highlights
  • Step-by-step decision guidance
  • Compare multiple options
  • Define and rate decision factors
  • Visual breakdown of pros and cons
  • Save and revisit past decisions
  • Avoid impulse choices
Features
Read full description

Make smarter choices and better decisions. Avoid regret. Feel confident. Facing a tough decision? Can’t decide which option is best? Whether you’re choosing a car, picking a school, buying a house, or planning a vacation — Michi helps you think clearly, compare wisely, and choose confidently. Unlike a coin flip, wheel spinner, or random picker app, Michi doesn’t leave important choices up to chance. It’s better than a coin toss because it actually helps you evaluate your options so you can decide now with clarity, not luck. What is Michi? Michi is your personal decision making assistant. It guides you step-by-step through comparing multiple options using the factors that matter most to you. In just minutes, you’ll have a clear breakdown of which option best fits your needs and why. Michi is great for decisions like: -Choosing between homes, apartments, or cities -Deciding on a car, laptop, or phone -Comparing job offers or career paths -Selecting the right school, course, or training program -Planning your next vacation -Evaluating service providers or subscriptions How It Works -Name your decision – e.g., “Which car should I buy?” -Define your factors – What matters most (Price, Features, Reliability, etc.) -Add your options – e.g., Car A, Car B, Car C -Rate each option – Based on how they stack up against your priorities -See your results – Michi calculates which option fits best, with a clear visual breakdown of pros and cons Pro Subscription Required Michi offers a free trial so you can explore all features before purchasing. After the trial, a Lifetime Michi Pro purchase is required to continue using the app. Choose the plan that works best for you: Free Trial (One Full Decisions): Analyze one free decision, then will need Lifetime Pro. Lifetime Pro: $1.99 What’s Included in Michi Pro -Unlimited decision projects -Unlimited options per project -Save and revisit past decisions -Full visual comparison breakdowns Why Choose Michi Pro? -Avoid impulse decisions -Feel confident knowing you considered what really matters -Get organized and stop overthinking -Make progress instead of staying stuck in indecision With Michi, you’ll never have to rely on a random spinner, wheel, or coin flip again. Instead, you’ll have a structured way to compare, evaluate, and choose the option that’s truly best for you. By downloading or using Michi, you agree to the Apple Standard End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Erebus Solar

This app helps solar professionals measure on-site shade using their phone's sensors. It generates horizon files compatible with leading PV design software, aiding in accurate solar production estimates.

Highlights
  • AR sun path visualization
  • Automatic sky capture
  • Sky Editor for obstruction tracing
  • Annual solar access analysis
  • PDF shade report export
  • Horizon file generation for design tools
  • Project organization by site
Features
Read full description

Measure shade on site with the hardware already in your pocket. Erebus Solar was designed by an electrical engineer and an architect with years of experience designing solar systems around the world. We were fed up with the horizon-finding hardware the industry still relies on: dedicated devices that haven't been meaningfully updated in decades, are slow to use and slow to find a GPS fix, and analog tools that need paper, a pencil and a latitude template that may not exist for your site. Erebus Solar is our answer. Your iPhone already has the camera, compass and sensors the job needs. WHY HORIZON FILES MATTER Far-field shading from trees, terrain and neighbouring buildings is one of the largest sources of error in a PV production estimate. A measured horizon profile, captured on site, lets your design software model that shading instead of guessing. Erebus Solar produces horizon files that leading PV design tools such as HelioScope and PVsyst read directly, and PV*SOL accepts the same convention. CAPTURE • AR sun path: today's arc, the solstice and equinox arcs and the live sun drawn over the real sky • Tap the real sun to calibrate the compass to true north • Automatic sky capture: sweep the envelope band and frames capture themselves, no buttons • Sky Editor: review the stitched sky and trace obstructions by hand, so the report reflects what you saw ANALYSE • Annual solar access and TSRF for each array area • Month-by-month charts and the sun-path chart with your obstructions • Aerial view with each area's boundary and the solar envelope over satellite imagery EXPORT • PDF shade report with your company name and logo • Horizon files for HelioScope, PVsyst and PV*SOL, generated from the same capture • Share straight from the phone ORGANISE • One project per site, located by address or GPS, with status from Created to Completed • Areas for each roof face or ground section • Everything stored on your iPhone: no account, no upload Erebus Solar's outputs are a design aid for qualified professionals. Results depend on the phone's sensors, compass calibration and sky conditions; check them against your own observations and your design tool's simulation before relying on them. Privacy Policy: https://erebussolar.app/privacy Terms of Use: https://erebussolar.app/terms

Screenshots

Decision Logic4 screens
Erebus Solar4 screens

Verdict

The call

The clearest difference is review sentiment: Decision Logic at 80% against Erebus Solar's 0%. Decision Logic also leads on rating (4.1 vs 3.7) and ratings volume (12 vs 3). Erebus Solar's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price and update cadence 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. Decision Logic sells 2 in-app purchases, starting at $1.99 per 7 days. Erebus Solar asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Decision Logic holds the better App Store score, 4.1 against 3.7. Both are backed by a comparable volume of ratings — 12 and 3 respectively. Written reviews point the same way: 80% of Decision Logic's written reviews are positive against 0% of Erebus Solar's.

UpkeepUpdate frequency

Decision Logic ships an update every 3 weeks, Erebus Solar every 2 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard8 real differences · 2 level
Decision Logic versus Erebus Solar: the parameters behind the verdict, then further details
ParameterDecision LogicErebus Solar
PriceFreeFree
Rating4.1 (12 ratings) — better3.7 (3 ratings)
Positive reviews80.0% of reviews — better0.0% of reviews
Number of ratings12 — better3
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS14.0.0 — better17.0
Further details — not scored
Size75 MB19 MB
Age rating4+4+
DeveloperSoutheast AdventuresTodd Evans

Customer experience

Decision Logic

All ratings12 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews10 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

Erebus Solar

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

2 purchases

Decision Logic

Subscriptions1
  • Weekly Pro Plan3 Days trial$1.997 Days
One-time1
  • Lifetime Pro Access$1.99
None

Erebus Solar

No in-app purchases

Questions

Is Decision Logic free?
Decision Logic is free to download, with in-app purchases available.
Is Erebus Solar free?
Erebus Solar is free to download, with no in-app purchases.
Which has better reviews, Decision Logic or Erebus Solar?
Decision Logic is rated higher. Decision Logic averages 4.1 out of 5 from 12 ratings, while Erebus Solar averages 3.7 from 3 ratings.
Do Decision Logic or Erebus Solar have ads?
Decision Logic shows ads; Erebus Solar does not.
Which is updated more often, Decision Logic or Erebus Solar?
Decision Logic ships an update every 3 weeks, and Erebus Solar every 2 weeks. Most recently, Decision Logic was updated on November 5, 2026 and Erebus Solar on October 31, 2026.

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