Alchemist/Counters

Bad against...

 * cancels out 's rapid health regeneration.


 * greatly reduces 's attack speed advantage.


 * can kill Alchemist before has the time to heal him.


 * , followed by take advantage of Alchemist's low base armor, making it easy to quickly kill him with physical damage.


 * - Invokers can win the mid lane easily against Alchemist because regen will nullify 's damage over time and  damage bonus will allow Invokers to out last hit Alchemist.


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Others

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Items

 * reduces 20px's already low base armor even further, and protects against his rapid physical attacks.
 * reduces 20px's attack speed and gives a fair amount of armor.
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Good against...

 * 's abilities rarely do enough damage to seriously harm Alchemist.


 * kills Phoenix very quickly in.


 * will take down in no time.
 * Alchemist can also farm the zombies for easy gold.


 * 's health regeneration and attack speed bonus will make fail.


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Works well with...

 * combined with makes Alchemist attack at insane speeds.


 * and will purge nasty stuff away.
 * combined with may give you some serious sustainability.
 * is an aoe purge, which will remove from enemies buffs like and, and also root them.


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Others

 * Alchemist works well with any hero that has an upgrade, as he can farm it for them (most likely far more quickly) and also free up an inventory slot. Sone heroes have permanent Scepter so it's useful to have one more item. Like Meepo, Timbersaw, Morphling, Treant Protector, Ogre Magi.
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List of heroes that counter Alchemist, and list of heroes that work well with Alchemist.