Comparison

iEngineer vs Dozuki

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

Head to head
About

iEngineer

Access a vast database of screw and bolt information, including dimensions, material grades, and strength properties for both US and metric fasteners. Features a comprehensive drill chart, unit conversion, and customizable material displays.

Highlights
  • Extensive US screw database
  • Metric screw database (in-app purchase)
  • Detailed dimensions and material grades
  • Strength, torque, and clamp force data
  • Head markings and 3D head models
  • Comprehensive drill chart
  • Unit conversion and data export
Features
Read full description

iEngineer is the most comprehensive database of screw/bolt information that you can find anywhere. US screws: -93 different screws from #0 to 4” -Dimensions for 9 standard head styles -74 material grades including SAE, ASTM, and other materials Metric Screws (available as in-app purchase): -210 different metric screws from M1.0 to M100 -Dimensions for 10 standard head styles for ISO, DIN, BS, and ANSI standards where available -86 material grades including 12 additional metric grades, SAE, ASTM, and other materials Displayed values for both the US and Metric screws include: -Standard dimensions -Tap sizes -Clearance hole sizes -Material strength -Recommended torque values -Clamp force -Shear force -Head markings display -3D model of head type -Standard dimensions of head type Other features: -Drill chart with 523 drill bit sizes -Fraction chart -Copy and paste data values -Fast and easy unit conversion -Ability to show/hide material grades in the interface so you only see what is relevant to you If you have any questions please contact us at support@perfectlysimpleapps.com

About

Dozuki

This app digitizes standard operating procedures and training materials for frontline workers. It ensures access to the latest versions, facilitates onboarding and retraining, and captures process data for continuous improvement and quality management.

Highlights
  • Digital work instructions
  • Frontline worker training
  • Continuous improvement feedback
  • Quality data collection
  • Version control for procedures
  • Electronic sign-offs
Features
Read full description

Today’s top industrial companies use Dozuki to create, control, and communicate standard training and work instructions to frontline workers from the floor to the field. Learn how you can upgrade your workforce with Dozuki at www.dozuki.com WORK INSTRUCTIONS Turn documented operating procedures into the standard all employees follow and train against. Dozuki delivers clear and concise digital work instructions that operators of any skill level can follow with confidence, and ensures workers only have access to the latest standard. FRONTLINE TRAINING Leverage documented standards as the foundation of your onboarding, cross-training, and retraining programs. Instantly view who is trained to the latest version and automate the training of workers when standards or employee roles change. CONTINUOUS IMPROVEMENT Integrate a feedback loop to capture process knowledge from your experts on the frontline. Allow workers to provide suggestions for process improvements directly within any step of a work instruction. QUALITY MANAGEMENT Collect data in-procedures to capture critical information about work orders. Require a supervisor to sign-off electronically at any stage of a procedure. VERSION CONTROL Rest easy knowing you can roll-back to previous versions and view the change history of any documented procedure. Track, approve, and release new versions of instructions with custom approval workflows — ensuring changes are approved. CAPTURE DATA Gather essential information from process workers while procedures are being completed. Collect information such as work order numbers, quality check values, or e-signatures from the floor, then export to your external systems. COMMON USE CASES • Preventative Maintenance • Quality Inspection • Lock Out Tag Out • ISO 9001 Certification • Production Assembly • Corrective Maintenance • Sanitation & Cleaning • Equipment Changeover • Shipping & Packaging LEARN MORE dozuki.com/features

Screenshots

iEngineer4 screens
Dozuki4 screens

Verdict

The call

The clearest difference is review sentiment: iEngineer at 86% against Dozuki's 25%. iEngineer also leads on ratings volume (200 vs 1). Dozuki's advantage is in-app purchases (none vs 1) and rating (5.0 vs 4.6). On price, ads 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. iEngineer sells 1 one-off in-app purchase. Dozuki asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Dozuki holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: iEngineer has 200 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 86% of iEngineer's written reviews are positive against 25% of Dozuki's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

iEngineer ships an update every 5 months, Dozuki every 2 weeks. The most recent releases landed on October 29, 2026 and October 10, 2026 respectively.

Scorecard7 real differences · 3 level
iEngineer versus Dozuki: the parameters behind the verdict, then further details
ParameteriEngineerDozuki
PriceFreeFree
Rating4.6 (200 ratings)5.0 (1 ratings) — better
Positive reviews85.5% of reviews — better25.0% of reviews
Number of ratings200 — better1
Update frequencyEvery 5 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.6 — better
Further details — not scored
Size12 MB72 MB
Age rating4+4+
DeveloperPerfectly Simple Apps LLCDozuki

Customer experience

iEngineer

All ratings197 ratings
Positive89.8%
Neutral4.1%
Negative6.1%
Written reviews159 reviews
Positive85.5%
Neutral6.3%
Negative8.2%

Dozuki

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews12 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

Bugs and requests

iEngineer

Reported bugs

2 issues
  • Metric portion not working for some users
  • Camera access request for no apparent reason

Requested features

4 requests
  • Add tap drill chart
  • Include clearance hole fits
  • Improve UI for larger displays
  • Add French language support

Dozuki

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

iEngineer

One-time1
  • Metric Screws$1.99
None

Dozuki

No in-app purchases

Questions

Is iEngineer free?
iEngineer is free to download, with in-app purchases available.
Is Dozuki free?
Dozuki is free to download, with no in-app purchases.
Which has better reviews, iEngineer or Dozuki?
Dozuki is rated higher. iEngineer averages 4.6 out of 5 from 200 ratings, while Dozuki averages 5.0 from 1 ratings.
Do iEngineer or Dozuki have ads?
Neither iEngineer nor Dozuki shows ads.
Which is updated more often, iEngineer or Dozuki?
iEngineer ships an update every 5 months, and Dozuki every 2 weeks. Most recently, iEngineer was updated on October 29, 2026 and Dozuki on October 10, 2026.

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