Software company · Istanbul · since 2021

Software built by the engineers you actually talk to.

Web platforms, mobile apps, APIs, SaaS and DevOps: delivered by senior engineers from first spec to production. We run 19 products of our own the same way.

Start a project →See our work
Seniorengineers only, no juniors
19products we built and run
Stagingfrom day one, not slides
kalenux ~ project/web-platformstaging live
DELIVERABLESTATUS
Scope document signedin progress
Architecture & data flowqueued
Frontend + API builtqueued
Admin dashboardqueued
Deployed to productionqueued
Monitoring onqueued
0 / 6 deliveredreviewed with you weekly
// services

What we build for you.

Eight services, one team. Pick one to see exactly what you walk away with.

DEVELOPMENT
CONSULTING
GROWTH
01 / 08Development

Web development

From landing pages to multi-user SaaS platforms.

Polished marketing sites, internal tools and platforms handling thousands of concurrent users, with versioned, documented APIs and security as the baseline.

WHAT YOU GET
✓Written requirements & scope
✓Architecture with data-flow diagrams
✓Full frontend & backend source
✓Deployed, production-ready app
✓Admin dashboard
✓30 days post-launch support
EXAMPLESWWhen Notes FlyFFileformerEExhibition Stands EU
Discuss this project →Full details
// how we work

Five steps. No surprises.

Every step ends with something you can hold: see exactly what you receive along the way.

STEP 01 / 05conversation

Discovery call

We learn what you are building and why: goals, constraints, budget and timeline. By the end, both sides know whether we are the right fit.

YOU RECEIVE
✓A clear read on feasibility
✓Honest answer on fit
✓Next steps in writing
discovery-call.ics
30-min video callbooked
Goals & success metricscovered
Constraints & budgetcovered
Timelinecovered
Fit decisionyes ✓
// our products

19 products. All live. All ours.

Designed, researched and engineered in-house: knowledge libraries, toolkits, AI platforms and Android apps with real users.

12 web platforms6 Android apps1 open-source framework
When Notes Fly screenshotscreenshot · whennotesfly.comLive
Knowledge librarywhennotesfly.com

When Notes Fly

In-depth, source-backed guides that read like book chapters, not blog posts.

6 knowledge areasFree + newsletter
Visit site →Explore
Whats Your IQ screenshotscreenshot · whats-your-iq.comLive
Cognitive platformwhats-your-iq.com

Whats Your IQ

Test, train, solve and learn: IQ test with four cognitive subscores.

175 tests9 languages
Visit site →Explore
Fileformer screenshotscreenshot · fileformer.comLive
File toolkitfileformer.com

Fileformer

100+ browser-based converters, compressors, PDF and image tools in one place.

100+ toolsNo sign-up
Visit site →Explore
QR & Barcode Tool screenshotscreenshot · qr-bar-code.comLive
QR & barcode toolkitqr-bar-code.com

QR & Barcode Tool

Generate, style, scan and export 35+ code formats, one at a time or in batch.

35+ formatsPNG · SVG · PDF
Visit site →Explore
Mirgent screenshotscreenshot · mirgent.com.trOpen beta
Social growth OSmirgent.com.tr

Mirgent

AI agents for content, lead discovery and scheduling: approval-gated.

19 networksFree plan
Visit site →Explore
CitePep screenshotscreenshot · citepep.comFounding network
Public trust recordcitepep.com

CitePep

Records who authored, reviewed and fact-checked a page: reputation you earn.

Accepted work onlyPublic corrections
Visit site →Explore
CertoJob screenshotscreenshot · certojob.comLive
Exam-to-career prepcertojob.com

CertoJob

Blueprint-mapped guides and practice tests for certifications and exams.

2,400+ questions40+ exams
Visit site →Explore
Corpy screenshotscreenshot · corpy.xyzLive
Formation intelligencecorpy.xyz

Corpy

Compare countries, entities, tax and free zones before you incorporate.

170+ company profiles8 countries
Visit site →Explore
Exhibition Stands EU screenshotscreenshot · exhibition-stands.euLive
Exhibition intelligenceexhibition-stands.eu

Exhibition Stands EU

Vetted stand builders, fair calendars and booth cost planning across Europe.

500+ builders50+ fairs
Visit site →Explore
Down Under Cafe screenshotscreenshot · downundercafe.comLive
Cafe discoverydownundercafe.com

Down Under Cafe

Cafes profiled by what they feel like inside: WiFi, noise, work score.

50+ citiesWork score
Visit site →Explore
Evolang screenshotscreenshot · evolang.infoLive
Language & writingevolang.info

Evolang

Write, communicate and learn languages: templates, grammar and 10+ languages.

English + 10Free, no login
Visit site →Explore
Strange Animals screenshotscreenshot · strangeanimals.infoLive
Wildlife encyclopediastrangeanimals.info

Strange Animals

The strangest, rarest and most extreme creatures, with the real biology.

500+ articles200+ species
Visit site →Explore
PhoneCMD screenshotscreenshot · Google PlayLive
Remote terminalGoogle Play

PhoneCMD

Run your PC from your phone: persistent terminals, coding CLIs, AI agent.

End-to-end encryptedDirect P2P
Google Play →Explore
VSCoder Copilot screenshotscreenshot · Google PlayLive
VS Code bridgeGoogle Play

VSCoder Copilot

Your VS Code workspace and Copilot on mobile, via secure pairing.

No port forwardingMIT extension
Google Play →Explore
QR & Barcode Scanner screenshotscreenshot · Google PlayLive
Scanner + generatorGoogle Play

QR & Barcode Scanner

Opens straight to the camera; decodes every major format, fully offline.

Camera-onlyOffline
Google Play →Explore
PDF & EPUB Reader screenshotscreenshot · Google PlayLive
Reader & editorGoogle Play

PDF & EPUB Reader

Offline reading and annotation with text-to-speech and night themes.

No adsOffline
Google Play →Explore
Phone Health Checker screenshotscreenshot · Google PlayLive
Device diagnosticsGoogle Play

Phone Health Checker

Battery health, live CPU and RAM, sensor tests and a device benchmark.

Battery · sensorsBenchmark
Google Play →Explore
True File Locker screenshotscreenshot · Google PlayLive
Encrypted vaultGoogle Play

True File Locker

AES-256 on-device encryption with a hidden calculator vault mode.

AES-256Biometric
Google Play →Explore
screenshot · GitHubOpen source
Build frameworkGitHub

Kalenuxer

The build and deploy pipeline behind every Kalenux web product.

15+ locales<1s rebuilds
GitHub →Explore
Flagship product

Kalenux SEO Audit: every fault, in fix order.

240+ technical checks plus PageSpeed across your whole site. Findings grouped by cause, not by page: the same engine we run on our own network.

01Crawl every URL
02Run 240+ checks
03Group by cause
04Fix in order
https://Run free audit
First audit free · credits from $9 · no subscription
kalenux audit: example-store.com0%
00:00.0QUEUE/
00:00.25QUEUE/shop
00:00.50QUEUE/shop/sneakers
00:00.75QUEUE/blog
00:01.0QUEUE/blog/guide-2024
00:01.25QUEUE/de/produkte
CHECKS RUN0
ISSUES0
// track record

Proof, not promises.

The scale we already run in production: the same engineering we bring to your project.

100K+/ month
people converting files privately, right in the browser
FFileformer↗
2,400+questions
free practice questions across 40+ certification exams
CCertoJob↗
Verbal
Spatial
Logical
Memory
175tests
cognitive tests with four-part scoring, in 9 languages
WWhats Your IQ↗
500+builders
vetted exhibition stand builders across 30+ European cities
EExhibition Stands EU↗
16 industries · 8 countries
170+companies
real company structures mapped for founders choosing where to incorporate
CCorpy↗
MammalsReptilesBirdsMarineInsectsExtinctEndangered
500+articles
expert wildlife articles covering 200+ of the world’s strangest species
SStrange Animals↗
// open source · public on GitHub

Kalenuxer, our build framework.

Every Kalenux site goes from source to production through one pipeline: rebuilding only what changed, in every language, with a single deploy command.

Full detailsView on GitHub →
01 · SOURCE→
header.htmlcached
pricing.css● changed
app.jscached
en.jsoncached
tr.jsoncached
Edit one file
02 · BUILD→
1 / 412 rebuilt0.8s
Rebuild only that
03 · LOCALISE→
ENTRDEESFRJARUARZH+6
one template pass
Ship in 15+ languages
04 · DEPLOY→
frontendapifull
$ kalenuxer deploy
● live on prod
One command to prod
10live products built with it
15+languages per build
<1sincremental rebuild
3deploy modes
// what people say

Trusted by clients. Used every day.

4.65★★★★★121 product reviewsRead all →
★★★★★Fileformer
“Tried it for converting between a dozen different formats and it handled everything perfectly. Very clean interface, works on mobile too.”
YYuki TanakaTokyo, Japan
★★★★★QR & Barcode
“We use this tool daily for generating barcodes for our retail inventory. Supports all the formats we need, outputs clean SVG and PNG. Huge time saver.”
CCarlos MendezMexico City, Mexico
★★★★★Whats Your IQ
“Took all three test lengths and found the experience very smooth. The results breakdown by cognitive domain is actually insightful, not just a single number.”
AAmara DialloAccra, Ghana
★★★★★When Notes Fly
“The depth of the Concepts and Ideas categories is remarkable. Each article connects to broader frameworks and the writing never pads content. I read it on my commute every day.”
MMatthias BauerZurich, Switzerland
// start a project

Tell us what you’re building.

Two minutes to brief us. An engineer, not a sales rep, replies within one business day with an honest assessment.

1
You send the briefWhat, why, and what success looks like.
2
An engineer repliesWithin one business day, with questions or a path forward.
3
Discovery callNo obligation. Clear on fit by the end of it.
✉ emirbaycan@kalenux.com.tr
I NEED
BUDGET
TIMELINE
ABOUT THE PROJECT
→ brief: web app · Not sure · flexible